PULSE MAG WELDING METHOD FOR HIGH-STRENGTH STEEL SHEET

PROBLEM TO BE SOLVED: To provide a pulse MAG welding method for a high-strength steel sheet, wherein, the arc is stable, the fit of a toe part is good, a weld bead that is wide can be obtained, there are no weld defects, and excellent weld metal mechanical performance can be obtained.SOLUTION: A pulse MAG welding method uses a solid wire that contains, in mass% based on the total wire mass, C: 0.02-0.15%, Si: 0.30-0.60%, Mn: 1.20-1.90%, Ni: 2.0-4.0%, Cr: 0.30-0.70%, Mo: 0.40-0.80%, the total of Cr and Mo : 0.75-1.15%, Ti: 0.02-0.07%, and Cu: 0.10-0.40%, with S: 0.03% or less and P: 0.03% or less, having pulse peak current (Ip): 440-600A and pulse base current (Ib): 30-80A, the pulse peak current (Ip) and pulse peak time (Tp) satisfying the following formula: 415≤Ip(A)×Tp(msec)≤780.SELECTED DRAWING: None 【課題】アークが安定し、止端部のなじみが良好で、ビード幅の広い溶接ビードが得られ、溶接欠陥がなく、かつ優れた溶接金属の機械的性能が得られる高強度薄鋼板のパルスＭＡＧ溶接方法の提供【解決手段】ワイヤ全質量に対する質量％で、Ｃ：０．０２〜０．１５％、Ｓｉ：０．３０〜０．６０％、Ｍｎ：１．２０〜１．９０％、Ｎｉ：２．０〜４．０％、Ｃｒ：０．３０〜０．７０％、Ｍｏ：０．４０〜０．８０％、かつＣｒとＭｏの合計：０．７５〜１．１５％、Ｔｉ：０．０２〜０．０７％、Ｃｕ：０．１０〜０．４０％を含有し、Ｓ：０．０３％以下、Ｐ：０．０３％以下であるソリッドワイヤを用いて、パルスピーク電流（Ｉｐ）：４４０〜６００Ａ、パルスベース電流（Ｉｂ）：３０〜８０Ａで、かつパルスピーク電流（Ｉｐ）とパルスピーク時間（Ｔｐ）が下記式を満足するパルスＭＡＧ溶接方法。４１５≦Ｉｐ（Ａ）×Ｔｐ（ｍｓｅｃ）≦７８０。【選択図】なし